Electric heater



Oct. 27, 1931. L D s 1,828,809

ELECTRIC HEATER Filed July 19, 1929 2 Sheets-Sheet l 7 5 v INVENTOR H.G. Land L13 Oct.27, 1931. H. G. LANDIS 1,823,309

ELECTRIC HEATER Filed July 19. 1929 2 Sheets-Sheet 2 Q N t:

t\ INVENTOR H,G.Lar1di8 Q .LLW.

ATTORN EY Patented Oct. 27. 1931 PATENT OFFICE HUGH G.'LANDIS, 01' LOSANGELES, CALIFORNIA ELECTRIC HEATER Application filed July 19,

This invention relates to electric heaters.

tionare to construct and arrange the parts of the heater in such amanner that the heater is more efficient, more compact and of neaterappearance and much less costly to manufacture than the former device.Also the arts are so assembled that any part may e readily removed whennecessary for ins ction or replacement or to. facilitate the s ipment ofthe device in a minimum of space. I I

These objects I accomplish by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claims.

In the drawings similar characters of reference indicate correspondingparts in the several views.

Fig. 1 is a side elevation of my improved heater.

Fig. 2 is a top plan view of the same with j 'the cover removed.

Fig. 3 is a transverse vertical section of the heater.

Fig. 4 is a fragmentary cross section on the line44ofFi .3. Fig. 5 is aragmentary view showing a modified form of guard.

Referring now more particularly to the characters of reference on thedrawings, the main body of the heater is a one-piece cylindrical elementcomprising an outer wall 1, an inner wall 2 and an intermediate wall 3all concentric with and spaced from each other.

4 which are relatively narrow in a horizontal plane. The intermediateand outer walls are connected at the top by a continuous solid web 5 andat the bottom by radial ribs 6 preferably relatively narrow in avertical plane. The body is supported a certain distance from the fioorby a plurality of legs 7 which at their upper ends have flat pads 8 59abutting against the outside of the outer wall The inner andintermediate walls are con nected only toward the bottomby radial ribsand the top of the web 5 the studs are formed 1929. Serial no. 879,433.

1. Each pad has vertically spaced dowel pins 9 projecting through the.wall, a removable securing bolt 10 between the dowels and a lug 11 toproject under the wall. Each leg is thus removably secured in place byonly a single bolt. while at the same time it I is rigidly held fromlateralor vertical movement independent of said bolt. This readyremovability of the'legs is a great convenience in shipping the device,as will be evident, and the subsequent remounting of the legs may beeasily accomplished by anyone without any special skill or tools beingnecessary.

The area enclosed by the inner wall 3 forms a chamber for the receptionof an electric motor 12 which is disposedon a vertical axis; saidchamber having lugs 13 projecting inwardly at the bottom to engage thebottom of the motor and limit the downward movement of the same. On topthe motor s engaged by a ring 14 removably fitted inside the wall 2 andheld against removal by a split spring ring 15 removably seated in agroove 16 provided in the chamber wall adiacent the top. A dished screen17 covers the area included by the intermediate wall and is removablysecured thereto at the bottom.

Spaced a certain distance from the top of the body is a solid cover cap18 having a depending side flange 18a all around the same;

a flat disc 19 extending across the cap area in the plane of the bottomedge of the flange.

.This disc bears against the bottom surfaces of bosses 20 depending fromthe cap. vertical studs 21 being secured in and depending from saidbosses and extending through the top web 5 of the body to which they areremovably secured by nuts 22 accessible from the bottom of the openspace between the walls 1 and 3. Between the lower face of the disc withenlarged portions 21a so as to hold the disc firmly clamped against theboss and also definitely locate the disc and cap in spaced relation tothe bodv. Fixed on the upper end of the motor shaft 23 and fitting cosely between the disc and the top of the body is a multi-blade' fan'24of the centrifugal type, the blades overhanging the open area betweenthe walls 2 and 3. Between the disc and the web 5 outwardly of the fan aforaminous guard band 25 is mounted. This band preferably comprises alength of stiff wire bent l to form vertical and spaced convolutionsthroughout its length, the lower ones of WhlCh convolutions seat in acircular groove 26 formed in the upper surface of the web 5,

while the upper convolutions merely bear closely against the disc. Theband therefore needs no other securing means to prevent its removal ordisplacement since it is held against upward movement by the disc andagainst lateral movement by the seating groove.

The open area between the walls 2 and 3 forms a chamber for the heatingunit which comprises resistance wires 27 of the usual helical type,preferably arranged as a pair of transversely spaced and helicallyextending coils. The ends of these coils are attached to terminals 28which are secured in vertically disposed mica plates 29, some of whichalso support the coils intermediate their ends. The plates arepreferably bound with metal edgings 30 to strengthen the same andprevent their splitting and warping. The plate members are removablysupported on the ribs 4 which are grooved along the top as at 31; othervertical grooves 32 beingcut in the adjacent faces of the walls 2 and 3in line with the ends of the grooves 31 and extending to the top of thebody. The plates maythus he removably slid into place from the top ofthe body and are then held against displacement in any direction withoutany securing means being necessary. The termi- 'nals 28 and the rotorofthe motor are con- 7 nected by suitably arranged wires (not shown) toindividual switches 33 mounted on the outside face of the body. as shownin. Fig. 1; the space between the walls 1 and 3 giving plenty of room tomake the-necessaryconneetions'without the switch box projectingoutwardly of the body to any extent.

top and has a wick 34 or the like projecting slightly from its u per"end and extendin downwardly to the arings of the shaft.

removable plug or scrdw 35 is mounted in the top of the cap directlyabove the shaft so that on removing this plug oil may be delivered tothe wick when necessaryyithout removing any other part.

In operatidn it will be seen that when the elements are heated therotation of the fan causes air to -be-drawnup from below the body pastthe elements and then into the room horizontally between the top of thebodyand the disc '19 in the form of a relatively narrow layer whichextends unbrokenly about the heater and provides a very efiicientheating of the air in the room. The disc and cap arrangement I peventing the cap from being overheated to provide'a dead air space anextent which would be'harmful to anyone happening to touch it. The spacebetween the walls 1 and 3 also forms aheat insulating jacket about theheating element, likew se reventing the exterior wall of the body frombecoming overheated. Said space also serves as a storage space durinshipment for the extension cord 36 provitfed'with the device forattachment to an ordinary light socket or outlet, and which isof courseconnected to the leads from the elements, motor and switches.

If desired, a guard in the form of a horizontally disposed band 37,extending closely about the studs 21a and set in notches N cut in saidstuds, as shown in Fig. 5,may be employed instead of the guard 25.

From the foregoing description it will be readily seen that I haveproduced such a device as substantially fulfills the objects of theinvention as set forth herein.

While this specification sets forth in detail the present and preferredconstructionof the device. still in practice such deviations from suchdetail may be resorted to as do not form a departure from the spirit ofthe invention, as defined by the appended claims.

Having thus describedmy invention what I claim as new and useful anddesire to secure by Letters Patent is:

1. .An electric heater including a body having a pair of circular wallsconcentric with and spaced from each other, legs supporting the bodyfrom the floor in clearance relation thereto, an electric motor mountedin the inner wall area, electric heating elements mounted in the spacebetween said walls, said space beingfreely open to the atmosphere bothat top and bottom of the body, and a centrifugal fan mounted on themotor shaft above the body and overhanging the space between said walls.

2 A device as in claim 1, with a solid disc disposed immediately abovethe fan and rigidly supported from the body outwardly of The motor shaftis hollow and open to the th e fan. p 3. An electric heater including abody having a pair of circular walls concentric with and spaced fromeach other, an electric heating element in horizontal coil form disposedin and extending about the space between said 'walls, circumferentiallyspaced insulation plates radial'with the body through, which said coilprojects, and means formed with the body for removably supporting saidplates.

4. An electric heater including a body hav walls, circumferentiallyspaced insulation.

plates radial with the body through which said coil projects, and radialribs between the walls under the coil and on which said plates rest. i

5. A structure as in claim 4, in which-the adjacent faces of the wallsfrom the ribs to the top of said walls are grooved to removably receivethe side edges of the plates.

6. In an electric heating device having a body, .an electric heatingelement mounted therein and open to the atmosphere, an electric motorset on a vertical axis and mounted in the body, a fan on the shaft ofthe motor I above the body, and a solid cap over the fan and motor; theshaft being hollowand open to its upper end, and the cap havin anormally plugged orifice directly above t e shaft to enable a lubricantto be introduced thereto.

7. In an electric heating device having a body, an electric heatingelement mounted therein and open to the atmosphere, a centrifugal fanmounted above the body, a solid disc disposed above the fan andsupported from the bed said disc extending beyond the plane the outeredges of the fan blades, and a forami'nous guard band extendingcontinuously about the body outwardly. of the fan and disposed betweenthe disc and top of the body in close engagement therewith; the bodyhaving a-groove in its upper surface to removably receive the lower edgeof the band. I y 8. An electric heating device comprising a body havinga pair of spaced and concentric walls providing a space freely open tothe atmosphere at top and bottom, said body having a flat surface on topprojecting outwardly from the outer wall, a heating element disposed insaid space, a solid disc over and spaced from the body and extending \tothe plane of the outer edge of said top surface of Q the body, and acentrifu 1 fan disposed in g the space between the b0 y and disc andterminating adjacent the outer one of said pair of body walls. g

In testimony whereof I afiix my signature. HUGH G. LANDIS.

